North America Native Plant

Winged Water-starwort

Botanical name: Callitriche marginata

USDA symbol: CAMA3

Life cycle: annual

Habit: forb

Native status: Native to Canada âš˜ Native to the lower 48 states  

Synonyms: Callitriche sepulta S. Watson (CASE21)   

Winged Water-Starwort: A Delicate Native for Your Water Garden If you’re looking to add authentic native charm to your pond or water feature, winged water-starwort might just be the perfect little plant you’ve never heard of. This diminutive aquatic beauty (Callitriche marginata) may not win any awards for showiness, but ...

Winged Water-Starwort: A Delicate Native for Your Water Garden

If you’re looking to add authentic native charm to your pond or water feature, winged water-starwort might just be the perfect little plant you’ve never heard of. This diminutive aquatic beauty (Callitriche marginata) may not win any awards for showiness, but it brings something special to wetland gardens that flashier plants simply can’t match.

What Makes This Plant Special?

Winged water-starwort is a true North American native, naturally occurring across the western United States and parts of the Great Lakes region. You’ll find it growing wild in British Columbia, California, Oregon, Washington, and Wisconsin. As an annual forb, this herbaceous plant completes its entire life cycle in just one growing season, making it a reliable self-seeding addition to appropriate water gardens.

The plant gets its intriguing common name from its tiny, delicate leaves that form distinctive star-shaped rosettes on the water’s surface. These rosettes seem to float effortlessly, creating subtle texture and natural movement in still water.

Where Does It Belong in Your Landscape?

This little water-lover is classified as an obligate wetland plant, which means it almost always needs to have its feet wet. If you’re creating a native water garden, pond edge, or bog garden, winged water-starwort could be exactly what you need to complete the picture. It’s particularly valuable for:

  • Natural-style ponds and water features
  • Wetland restoration projects
  • Native plant rain gardens with standing water
  • Shallow areas of larger water gardens

Growing Winged Water-Starwort Successfully

The good news is that this plant isn’t particularly fussy – as long as you can meet its one non-negotiable requirement: water. Here’s what you need to know:

Ideal Growing Conditions

  • Water depth: Shallow water or consistently muddy soil
  • Light: Full sun to partial shade
  • Soil: Muddy or silty substrates work best
  • Climate: Hardy in USDA zones 3-9

Planting and Care Tips

Since winged water-starwort is an annual that readily self-seeds, getting it established is usually a matter of providing the right conditions and being patient. The plant will naturally colonize suitable wet areas once introduced. If you’re starting from seed, simply scatter them in shallow water or on muddy soil in early spring.

Maintenance is minimal – this is definitely a plant it and forget it species, assuming you can maintain consistent moisture. The biggest challenge most gardeners face is simply keeping the growing area wet enough throughout the growing season.

Should You Grow It?

Winged water-starwort isn’t going to be the star of your garden show, but it serves important ecological functions. As a native species, it supports local ecosystems in ways that non-native alternatives simply can’t match. While we don’t have specific data on its wildlife benefits, aquatic plants like this typically provide habitat for small invertebrates and contribute to overall water garden biodiversity.

Consider adding winged water-starwort to your water garden if you:

  • Want to create authentic native wetland habitat
  • Appreciate subtle, naturalistic garden design
  • Have a reliable water source for your pond or bog garden
  • Enjoy watching how ecosystems develop naturally over time

While it may not have the dramatic appeal of water lilies or the architectural presence of cattails, winged water-starwort brings quiet authenticity to water gardens. Sometimes the most valuable plants are the ones that do their job quietly, creating the perfect backdrop for nature’s larger drama to unfold.

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" matching plants to their ideal growing conditions, so they'll thrive with less work and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection is. While tags list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. Surprisingly, many popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. Also, it helps you make smarter gardening choices and grow healthy plants with less care and feeding, saving you time, frustration, and money while producing an attractive garden with greater ecological benefits.

Regions
Status
Moisture Conditions

Arid West

OBL

Obligate Wetland - Plants with this status almost always occurs in wetlands

Northcentral & Northeast

OBL

Obligate Wetland - Plants with this status almost always occurs in wetlands

Western Mountains, Valleys, and Coast

OBL

Obligate Wetland - Plants with this status almost always occurs in wetlands

Winged Water-starwort

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Callitrichales

Family

Callitrichaceae Link. - Water-starwort family

Genus

Callitriche L. - water-starwort

Species

Callitriche marginata Torr. - winged water-starwort

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA